Communication device based on flexible circuit board

ABSTRACT

Provided is a communication device based on a flexible circuit board communicating wirelessly. The communication device includes: a control unit configured to collectively control the communication device based on the flexible circuit board; a power supply unit configured to supply power to a configuration included in the communication device based on the flexible circuit board based on a control of the control unit; a flexible circuit board; and a plurality of antennas disposed on the flexible circuit board.

CROSS-REFERENCE TO RELATED APPLICATIONS

This U.S. non-provisional patent application claims priority under 35U.S.C. § 119 of Korean Patent Application No. 10-2017-0161134, filed onNov. 29, 2017, the entire contents of which are hereby incorporated byreference.

TECHNICAL FIELD

The present invention relates to a communication device based on aflexible circuit board for wireless communication with an RF tag, andmore particularly, to a communication device based on a flexible circuitboard including a plurality of antennas communicating with an RF tag toprecisely estimate the location of the RF tag and determining whether aflexible printed circuit board on which a plurality of antennas aredisposed is folded. Further, the present invention relates to a safetydevice for a flexible circuit board, which is characterized by measuringa damage portion of a specific area of the flexible circuit boardthrough measurement on whether it is normal with a measurement orverification sensor for an amount of current supplied to each.

BACKGROUND ART

RF is an abbreviation of Radio Frequency and is a communication methodfor exchanging information by radiating radio frequency. As a technologyto replace the barcode that has been widely used in the past, shortrange wireless communication is attracting attention. Since short rangewireless communications may process more information than barcodes andmay transmit and receive information without touching or scanningdirectly, recently, its application range is expanding.

The short range wireless communication is used to attach a short rangewireless communication tag to objects to be targets such as objects, anda reader reads the tag to transmit/receive information.

The tag includes a tag chip for storing information and processingsignals and an antenna unit for transmitting and receiving signals. Theantenna unit has an RF characteristic capable of transmitting andreceiving a frequency corresponding to a signal transmitted and receivedby the reader.

A flexible circuit board refers to an electronic circuit composed of aflexible material that may be easily bent and folded.

SUMMARY

The present disclosure is to provide a communication device based on aflexible circuit board including a plurality of antennas communicatingwith an RF tag to precisely calculate the location of the tag.

The present disclosure also is to variously activate a plurality ofantennas included in a communication device based on a flexible circuitboard to calculate the location of the RF tag while minimizing powerconsumption.

The present disclosure also is to recognize the bending of a flexiblecircuit board in a communication device based on a flexible circuitboard.

An embodiment of the inventive concept provides a communication devicebased on a flexible circuit board communicating wirelessly. Thecommunication device includes: a control unit configured to collectivelycontrol the communication device based on the flexible circuit board; apower supply unit configured to supply power to a configuration includedin the communication device based on the flexible circuit board based ona control of the control unit; a flexible circuit board; and a pluralityof antennas disposed on the flexible circuit board.

In an embodiment, the power supply unit may adjust an amount of currentsupplied to each of a plurality of antennas so that a detection range ofone antenna does not overlap a detection range of another antenna.

In an embodiment, the power supply unit may adjust an amount of currentsupplied to each of the plurality of antennas so that a detection rangeof one antenna may overlap a detection range of another antenna closestto the one antenna.

In an embodiment, the power supply unit may adjust an amount of currentsupplied to each of the plurality of antennas so that a detection rangeof one antenna may overlap a detection range of another antenna that isthe second closest to the one antenna.

In an embodiment, the control unit may calculate a location of an RF tagbased on an antenna for wirelessly communicating with the RF tag, and asignal strength of a signal received by the antenna from the RF tag.

In an embodiment, the plurality of antennas may be arranged in aplurality of rows and columns, wherein the power supply unitsequentially may apply power to a plurality of antennas in ascendingorder of the rows, and apply power to a plurality of antennas located inthe same row in ascending order of the columns.

In an embodiment, the plurality of antennas may be arranged in aplurality of rows and columns, wherein the power supply unit may supplypower to only one antenna of two antennas disposed closest to eachother.

In an embodiment, an RF tag may be disposed on the flexible circuitboard, wherein the control unit may determine whether the flexiblecircuit board is bent based on a received signal strength received bythe plurality of antennas from the RF tag.

In an embodiment of the inventive concept, a safety device based on aflexible circuit board includes: a control unit configured tocollectively control the safety device based on the flexible circuitboard; a power supply unit configured to supplying power to aconfiguration included in the safety device based on the flexiblecircuit board based on a control of the control unit; and a flexiblecircuit board, wherein a damage portion of a specific area of theflexible circuit board is measured through measurement on whether it isnormal with a measurement or verification sensor for an amount ofcurrent supplied to each.

In an embodiment of the inventive concept, provided is a device with abuilt-in protection circuit to recognize bending in a flexible circuitboard and to prevent fire and malfunction, wherein the device with thebuilt-in protection circuit includes the device above.

In an embodiment of the inventive concept, provided is a storage mediumfor storing software to recognize bending in a flexible circuit boardand to prevent fire and malfunction, which is implemented in the deviceabove.

BRIEF DESCRIPTION OF THE FIGURES

The accompanying drawings are included to provide a furtherunderstanding of the inventive concept, and are incorporated in andconstitute a part of this specification. The drawings illustrateexemplary embodiments of the inventive concept and, together with thedescription, serve to explain principles of the inventive concept. Inthe drawings:

FIG. 1 shows the overall configuration of a communication device basedon a flexible circuit board according to an embodiment;

FIG. 2 shows a plurality of antennas disposed on a control unit, a powersupply unit, and a flexible circuit board according to an embodiment;

FIG. 3 shows a plurality of antennas disposed on a control unit, a powersupply unit, and a flexible circuit board according to an embodiment;

FIG. 4 shows a plurality of antennas disposed on a control unit, a powersupply unit, and a flexible circuit board according to an embodiment;

FIG. 5 shows a plurality of antennas disposed on a control unit, a powersupply unit, and a flexible circuit board according to an embodiment;

FIG. 6 shows a plurality of antennas disposed on a control unit, a powersupply unit, and a flexible circuit board according to an embodiment;

FIG. 7 shows various embodiments in which a power supply unit suppliespower to an antenna; and

FIG. 8 shows a moved RF tag and an antenna 103 communicating with a tagas a flexible circuit board is bent.

DETAILED DESCRIPTION

The foregoing and further aspects are embodied through the embodimentsdescribed with reference to the accompanying drawings. It will beunderstood that the components of each embodiment are possible invarious combinations within the embodiments as long as there is no othercomment or mutual contradiction. Furthermore, the present invention may,however, be embodied in different forms and should not be constructed aslimited to the embodiments set forth herein.

Parts not relating to description are omitted in the drawings in orderto clearly describe the present invention and like reference numeralsrefer to like elements throughout. Furthermore, when it is describedthat one comprises (or includes or has) some elements, it should beunderstood that it may comprise (or include or has) only those elements,or it may comprise (or include or have) other elements as well as thoseelements if there is no specific limitation.

In addition, throughout the specification, when a portion is referred toas being “connected” to another portion, it includes not only “directlyconnected” but also “electrically connected” with another elementtherebetween. Further, in the specification, a signal means an amount ofelectricity such as a voltage or a current.

As used herein, a “unit” refers to a “block for configuring a system ofhardware or software to be changed or pluggable”, and that is, is a unitor block that performs a specific function in hardware or software.

FIG. 1 shows the overall configuration of a communication device basedon a flexible circuit board according to an embodiment. FIG. 2 shows aplurality of antennas 103 disposed on a control unit 101, a power supplyunit 102, and a flexible circuit board 104 according to an embodiment.

A communication device based on a flexible circuit board wirelesslycommunicating with an RF tag 106 includes a control unit 101 forcontrolling the communication device based on the flexible circuit boardoverall; a power supply unit 102 for supplying power to the componentsin the communication device based on the flexible circuit board based onthe control of the control unit 101; a flexible circuit board 104; and aplurality of antennas 103 disposed on the flexible circuit board 104.The power supply unit 102 adjusts the detection range of each of theplurality of antennas 103 by adjusting the amount of current supplied toeach of the plurality of antennas 103, and the detection range is withina maximum distance within which the antenna 103 receives a signal fromthe RF tag 106.

The wireless communication includes a technique for identifying anobject using a radio frequency (RF), and refers to a system that uses‘non-contact or radio frequency recognition technology’ thatautomatically recognizes, by a reader, data stored in a tag, label,card, etc. with a built-in microchip through radio frequency. Thewireless communication may include RFID, NFC, and the like.

An RFID system is composed of an RF reader that performs a reading anddecoding function and a RFID tag that stores information and exchangesdata using a protocol. The tag 106 is composed of a semiconductortransponder chip and an antenna 103, and the antenna 103 of the tag 106receives a radio signal generated and propagated in the antenna 103 of areader configured in an RF field. The chip of the tag 106 receivesenergy and transmits pre-programmed data, and such transmission of datais performed by modulating a part of the radio signal received at theantenna 106 of the tag 106 and echoing it to the reader.

NFC-based tags and readers operate in active or passive communicationmode. In the active communication mode, both the tag and the readerserve as a power supply. That is, either the tag or the reader may be areceiver for receiving data. In the passive communication mode, the tagreceives power by the electromagnetic field provided by the reader andoperates.

The antenna 103 of the tag 106 is divided into an antenna 103 for apassive tag 106 using an inductive current and a self-powered antenna103 for an active tag 106.

The antenna 103 of the tag 106 is printed on a thin film material or aprinted circuit board material to be made small, and is used tocommunicate with the reader to transmit data and recognize the otherparty. In general, the antenna 103 of the tag 106 has a characteristicin which the beam pattern is oriented in the vertical direction of thethin film or the material surface of the printed circuit board.

The control unit 101 controls the communication device based on theflexible circuit board overall. The control unit 101 is amicrocontroller or a microprocessor. That is, the control unit 101 maybe implemented by a microprocessor or a microcontroller executing aprogram stored in a memory. The control unit 101 generates an RF signaland radiates the RF signal through an antenna 103, which will bedescribed later.

The power supply unit 102 supplies power to the components of thecommunication device based on the flexible circuit board, based on thecontrol of the control unit 101. The above configuration is all theconfigurations that the communication device based on the flexiblecircuit board 100 includes.

The flexible printed circuit board 104 is a circuit board with a copperfoil on a thin insulation film having a thickness of 10 μm, and unlikerigid hard substrates, is thin and flexible. Although the flexiblecircuit board 104 is not shown in FIG. 1, it is clear that the flexiblecircuit board 104 is a component of the communication device based onthe flexible circuit board 100.

A plurality of antennas 103 are disposed on the flexible circuit board104. The plurality of antennas 103 may communicate with each RF tag 106.The plurality of antennas 103 may be arranged in a lattice pattern, asshown in FIG. 2. The shape in which the plurality of antennas 103 aredisposed is not limited to the lattice pattern.

The power supply unit 102 adjusts the detection range of each of theplurality of antennas 103 by adjusting the amount of current supplied toeach of the plurality of antennas 103, and the detection range is arange in which the antenna 103 receives a signal from the RF tag 106.

When the amount of current supplied by the power supply unit 102 to theantenna 103 increases, the detection range of the antenna 103 iswidened.

FIG. 3 shows a plurality of antennas 103 disposed on a control unit 101,a power supply unit 102 and a flexible circuit board 104 according to anembodiment. The antenna according to FIG. 3 detects the tag at a shortdistance. The nearest antennas are located remotely from each other anddo not overlap the detection range. Accordingly, the antennas accordingto FIG. 3 may perform multiple parallel reading without crosstalk eachother, and the data collected for location confirmation checks thetransmission/reception signal level and has the feature of the readingpoint location information.

It is shown that in the embodiment according to FIGS. 3 to 6, only theantenna 103 is arranged on the flexible circuit board 104. FIG. 2 showsa plurality of antennas 103 disposed on a control unit 101, a powersupply unit 102 and a flexible circuit board 104 according to anembodiment.

The power supply unit 102 adjusts the amount of current supplied to eachof the plurality of antennas 103, so that the detection range of one ofthe antennas 103 does not overlap the detection range of the other oneof the antennas 103. Referring to FIG. 3, it may be checked that thedetection ranges of the two closest antennas 103 a and 103 b do notoverlap with each other. If the detection range overlaps, the powersupply unit 102 reduces the amount of current supplied to the antenna103 to narrow the detection range. If the distance between the boundarylines of the detection ranges is greater than the reference value, thepower supply unit 102 increases the amount of current supplied to theantenna 103 to widen the detection range.

FIG. 4 shows a plurality of antennas 103 disposed on a control unit 101,a power supply unit 102 and a flexible circuit board 104 according to anembodiment. The antenna according to FIG. 3 detects the tag at a mediumdistance. The nearest antennas are arranged at a medium distance fromeach other, so that the detection range is partially overlapped.

The power supply unit 102 adjusts the amount of current supplied to eachof the plurality of antennas 103, so that the detection range of any oneof the antennas 103 overlaps the detection range of the other antenna103 closest to the one of the antennas 103. In the embodiment accordingto FIG. 3, if the power supply unit 102 supplies more current to theantenna 103 than the current supplied to the antenna 103, the detectionrange for each antenna 103 may be widened. Referring to FIG. 4, it maybe checked that the detection range of one antenna 103 a overlaps thedetection range of the two antennas 103 b and 103 c closest to theantenna 103 a.

FIG. 5 shows a plurality of antennas 103 disposed on a control unit 101,a power supply unit 102 and a flexible circuit board 104 according to anembodiment. The antenna according to FIG. 5 detects the tag at a longdistance. Two adjacent antennas are arranged close to each other. Thedetection ranges of the plurality of antennas are overlapped, so that ina sequential search, it is possible to perform a double or triple searchand a distribution diagram is generated. Collection data for locationconfirmation checks the transmission/reception signal level, checks thereading point location information, generates a reception distributiondiagram, and check a crosstalk material.

The power supply unit 102 adjusts the amount of current supplied to eachof the plurality of antennas 103, so that the detection range of any oneof the antennas 103 overlaps the detection range of the other antenna103 that is the second closest to the one of the antennas 103. In theembodiment according to FIG. 4, if the power supply unit 102 suppliesmore current to the antenna 103 than the current supplied to the antenna103, the detection range for each antenna 103 may be widened. In theembodiment according to FIG. 5, it may be checked that the detectionrange of one antenna 103 a overlaps the detection range of the twoantennas 103 b and 103 c closest to the antenna 103 a. Furthermore, itmay be checked that the detection range of one antenna 103 a overlapsthe detection range of the two antennas 103 d that are the secondclosest to the antenna 103 a.

FIG. 6 shows a plurality of antennas 103 disposed on a control unit 101,a power supply unit 102 and a flexible circuit board 104 according to anembodiment.

The control unit 101 calculates the location of the RF tag based on theantenna 103 for wirelessly communicating with the RF tag 106, and thesignal strength of the signal received by the antenna 103 from the RFtag 106.

FIG. 6 shows the RF tag 106 disposed on the flexible circuit board 104.The signal transmission range of the tag 106 is related to the powersupplied by the antenna 103. When the antenna 103 emits a strong signalas the supplied power increases, the RF tag 106 transmits a signal tothe peripheral antenna 103 based on the signal. FIG. 6 shows the signaltransmission range of the RF tag 106. If the transmission range 107 a isnarrow, only one antenna 103 a receives a signal from the RF tag 106.The control unit 101 determines that there is an RF tag 106 around theantenna 103 a.

If a transmission range 107 b is above the reference value, more thanthree antennas 103 a, 103 b, 103 c, and 103 d receive signals from theRF tag 106. The control unit 101 calculates the location of the RF tag106 based on the triangulation method using the received signal strengthof the antennas 103 a, 103 b, 103 c, and 103 d.

If a transmission range 107 c is above the reference value, more thanthree antennas 103 a, 103 b, 103 c, 103 d, 103 e, and 103 f receivesignals from the RF tag 106. The control unit 101 calculates thelocation of the RF tag 106 based on the triangulation method using thereceived signal strength of the antennas 103 a, 103 b, 103 c, 103 d, 103d, 103 e, and 103 f.

FIG. 7 shows various embodiments in which the power supply unit 102supplies power to the antenna 103. Referring to FIG. 7(a), the pluralityof antennas 103 are arranged in a plurality of rows and columns. Thepower supply unit 102 sequentially applies power to the plurality ofantennas 103 in ascending order of the rows, and applies power to theplurality of antennas 103 located in the same row in ascending order ofthe columns. Referring to FIG. 7(a), although the speed is slow withsequential search, the possibility of crosstalk is minimized.

Applying power sequentially to the plurality of antennas 103 inascending order of the rows by the power supply unit 102 means supplyingpower in the order of rows (1) to (6) in FIG. 7(a). Additionally, in thesame row, power is supplied in the order of 103 a, 103 b, 103 c, and 103d. The power supply unit 102 sequentially supplies power to one antenna103, and the control unit 101 determines that the RF tag 106 is locatednear the antenna 103 having the largest received signal strength fromthe RF tag 106.

Referring to FIG. 7(b), the plurality of antennas 103 are arranged in aplurality of rows and columns. The power supply unit 102 supplies powerto only one antenna 103 of the two antennas 103 disposed closest to eachother. Power is supplied to only one of the two antennas 103 a and 103 bdisposed closest to each other. That is, power is supplied to only oneantenna 103 of two arbitrary antennas 103 closest to each other in FIG.7(b). The power supply unit 102 supplies power to only one antenna 103of two antennas 103 closest to each other, and the control unit 101determines that the RF tag 106 is located near the antenna 103 havingthe largest received signal strength from the RF tag 106. It is possibleto estimate the location of the RF tag 106 without supplying power toall the antennas 103, thereby reducing power consumption.

Referring to FIG. 7(c), the power supply unit 102 supplies power to allthe antennas 103 for a predetermined time and cuts off the power. Then,after a predetermined time, the power is supplied again. That is, thepower supply unit 102 repeatedly cuts off the power supply to all theantennas 103. The power supply unit 102 sequentially supplies power toone antenna 103, and the control unit 101 determines that the RF tag 106is located near the antenna 103 having the largest received signalstrength from the RF tag 106. Also, the control unit 101 may accuratelycalculate the location of the tag 106 through the triangulation method.Power consumption may be reduced in that power supply to the antenna 103is not always performed.

FIGS. 7(b) and 7(c) show that the possibility of crosstalk existsalthough the search speed is fast due to multiple searches.

FIG. 8 shows the moved RF tag 106 and the antenna 103 communicating withthe tag 106 as the flexible circuit board 104 is bent.

The RF tag 106 is disposed on the flexible circuit board 104, and thecontrol unit 101 determines whether the flexible circuit board 104 isfolded based on the received signal strengths received from theplurality of antennas 103 from the RF tag 106.

Not only the antenna 103 but also the RF tag 106 itself may be disposedon the flexible circuit board 104. When the antenna 103, which is spaceda predetermined distance from the RF tag 106 in the plane on theflexible circuit board 104, receives a signal from the tag 106, thecontrol unit 101 determines that the flexible circuit board 104 isfolded. Also, the control unit 101 determines how much the flexiblecircuit board is folded based on the strength of the signal received bythe antenna 103 which is spaced a predetermined distance from the RF tag106.

In a communication device based on a flexible circuit board with wiredcommunication with a tag, the communication device based on the flexiblecircuit board includes a control unit for controlling the communicationdevice based on the flexible circuit board overall; a power supply unitfor supplying power to the communication device based on the control ofthe control unit based on a control of the control unit; a flexiblecircuit board; and a plurality of antennas disposed on the flexiblecircuit board. The power supply unit adjusts the amount of currentsupplied to each of the plurality of antennas to adjust the detectionrange of each of the plurality of antennas. The detection range is arange within a longest distance at which an antenna receives a signalfrom an RF tag, and an RF tag is disposed on the flexible circuit board.The control unit determines whether the flexible circuit board is foldedbased on a received signal strength received by the plurality ofantennas from the RF tag.

When the flexible circuit board is bent, it is possible to recognize thetag located in a specific area and determine the bending degree andlocation. It is possible to stop the actual electric operation byreading in real time a case where the flexible circuit board is bent ora case where the bent area is shorted.

The bending of a flexible circuit board is determined by a wirelesscommunication method, a sensor, communication disconnection, andcommunication noise measurement.

A communication device based on a flexible circuit board according tothe suggested present invention includes a plurality of antennascommunicating with an RF tag to precisely calculate the location of thetag.

It is possible to variously activate a plurality of antennas included ina communication device based on a flexible circuit board according tothe suggested present invention to calculate the location of the RF tagwhile minimizing power consumption.

It is possible to recognize the bending of a flexible circuit board in acommunication device based on a flexible circuit board according to thesuggested present invention.

A communication device based on a flexible circuit board according tothe suggested present invention prevents signal interference caused bythe overlapping of detection ranges of a plurality of antennas, therebyeliminating the erroneous recognition.

A communication device based on a flexible circuit board according tothe suggested present invention may accurately calculate the location ofa wireless communicating tag.

The effects of the present invention are not limited to the effectsmentioned above, and various effects may be included within the scope ofwhat will be apparent to a person skilled in the art from the followingdescription.

In such a way, those skilled in the art will appreciate that the presentinvention may be embodied in other specific forms without departing fromthe spirit or essential characteristics thereof. Therefore, it should beunderstood that the embodiments described above are merely illustrative,and the scope is not limited. Also, the flowcharts shown in the drawingare merely the sequential steps illustrated by way of example in orderto achieve the most desirable results in practicing the presentinvention, and it is apparent that other additional steps may beprovided or some steps may be deleted.

The technical features and implementations executing this described inthis specification may be implemented in digital electronic circuits, ormay be embodied in computer software, firmware, or hardware, includingthe structures described herein, and structural equivalents thereof, ormay be embodied in a combination of one or more of these. Also,implementations executing the technical features described in thisspecification may be implemented as modules relating to computer programinstructions encoded on a type of program storage medium in order tocontrol a computer program product, that is, an operation of aprocessing system or its execution

In such a way, this specification is not intended to limit the presentinvention by the disclosed specific term. Therefore, while the presentinvention has been particularly shown and described with reference toexemplary embodiments thereof, those of ordinary skill in the art willmade modifications, changes, and variations to the embodiments withoutdeparting from the scope of the present invention.

The scope of the present invention is defined by the appended claimsrather than the above detailed description, and all changes ormodifications derived from the meaning and range of the appended claimsand equivalents thereof are to be interpreted as being included withinthe scope of present invention.

What is claimed is:
 1. A communication device based on a flexiblecircuit board communicating wirelessly, the communication devicecomprising: a control unit configured to collectively control thecommunication device based on the flexible circuit board; a power supplyunit configured to supply power to a configuration included in thecommunication device based on the flexible circuit board based on acontrol of the control unit; a flexible circuit board; and a pluralityof antennas disposed on the flexible circuit board.
 2. The communicationdevice of claim 1, wherein the power supply unit adjusts an amount ofcurrent supplied to each of a plurality of antennas so that a detectionrange of one antenna does not overlap a detection range of anotherantenna.
 3. The communication device of claim 1, wherein the powersupply unit adjusts an amount of current supplied to each of theplurality of antennas so that a detection range of one antenna overlapsa detection range of another antenna closest to the one antenna.
 4. Thecommunication device of claim 1, wherein the power supply unit adjustsan amount of current supplied to each of the plurality of antennas sothat a detection range of one antenna overlaps a detection range ofanother antenna that is the second closest to the one antenna.
 5. Thecommunication device of claim 1, wherein the control unit calculates alocation of an RF tag based on an antenna for wirelessly communicatingwith the RF tag, and a signal strength of a signal received by theantenna from the RF tag.
 6. The communication device of claim 1, whereinthe plurality of antennas are arranged in a plurality of rows andcolumns, wherein the power supply unit sequentially applies power to aplurality of antennas in ascending order of the rows, and applies powerto a plurality of antennas located in the same row in ascending order ofthe columns.
 7. The communication device of claim 1, wherein theplurality of antennas are arranged in a plurality of rows and columns,wherein the power supply unit supplies power to only one antenna of twoantennas disposed closest to each other.
 8. The communication device ofclaim 1, wherein an RF tag is disposed on the flexible circuit board,wherein the control unit determines whether the flexible circuit boardis bent based on a received signal strength received by the plurality ofantennas from the RF tag.
 9. A safety device based on a flexible circuitboard, the safety device comprising: a control unit configured tocollectively control the safety device based on the flexible circuitboard; a power supply unit configured to supplying power to aconfiguration included in the safety device based on the flexiblecircuit board based on a control of the control unit; and a flexiblecircuit board, wherein a damage portion of a specific area of theflexible circuit board is measured through measurement on whether it isnormal with a measurement or verification sensor for an amount ofcurrent supplied to each.
 10. A device with a built-in protectioncircuit to recognize bending in a flexible circuit board and to preventfire and malfunction, wherein the device with the built-in protectioncircuit comprises the device according to claim
 1. 11. A device with abuilt-in protection circuit to recognize bending in a flexible circuitboard and to prevent fire and malfunction, wherein the device with thebuilt-in protection circuit comprises the device according to claim 9.12. A storage medium for storing software to recognize bending in aflexible circuit board and to prevent fire and malfunction, which isimplemented in the device according to claim
 1. 13. A storage medium forstoring software to recognize bending in a flexible circuit board and toprevent fire and malfunction, which is implemented in the deviceaccording to claim 9.